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ASSETS AND LIABILITIES HELD FOR SALE (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Current Assets and Liabilities Held for Sale        
Health plan assets held for sale   $ 16    
Health plan liabilities held for sale   13    
Assets held for sale   17   $ 550
Proceeds from sales of facilities and other assets   573 $ 28  
Net receivables   2,786   2,704
Liabilities held for sale   13   101
Impairment charges   2 $ 147  
Georgia Facilities | Disposal Group, Held-for-sale, Not Discontinued Operations        
Current Assets and Liabilities Held for Sale        
Assets held for sale       549
Liabilities held for sale       $ 101
Georgia Facilities | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Current Assets and Liabilities Held for Sale        
Proceeds from sales of facilities and other assets $ 575      
Net receivables   $ 61    
Gain on sale $ 113